Ill. Admin. Code tit. 77, pt. 870, tbl. D

Current through Register Vol. 48, No. 49, December 6, 2024

Table D - Footing Areas Required for Soil's Load-Bearing Capacity - Design Roof Load 40 Pounds Per Square Foot

Section Width (feet)
12	14	16	12	14	16	12	14	16
Support Spacing (feet)
6	6	6	8	8	8	10	10	10
Support Loading (pounds per pier)
3950	4650	5300	5300	6150	7050	6600	7700	8800*
Soil's Load- Bearing Capacity (lbs/ft2)	Footing Area (square inches)
1000	569	670	763	763	886	1015	950	1109	1267
1500	379	446	509	509	590	677	634	739	845
2000	284	335	382	382	443	508	475	554	634
3000	190	223	254	254	295	338	317	370	422
4000	144	167	191	191	221	254	238	277	317

a) First footing centered within 2 feet from end of home.

b)* Individual supports, concrete 8"x8"x16" blocks, shall NOT support loads greater than 8,000 pounds for a single stack and 14,000 pounds for a double stack pier.

Ill. Admin. Code tit. 77, pt. 870, tbl. D